Based on the experimental data collected , the formulations which can predict accurately in - tube boiling heat transfer coefficients of r290 and r404a are seleted . shah correlation can predict precisely heat transfer coefficients of r290 and r404a in horizontal smooth tube . koyama correlation which is modified can predict precisely heat transfer coefficients of r290 inside horizontal microfin tube Shah关联式对r290和r404a在光管内的沸腾换热系数预测精度最高； koyama关联式经修正后可较好的预测r290在内螺纹管中的沸腾换热系数； thome关联式对r404a在内螺纹管中的沸腾换热系数有良好的预测精度。
